QT学习之 QwtPlot（数学绘图）

来源：互联网发布：淘宝直播间打字在哪编辑：程序博客网时间：2024/05/22 07:54

QT对于统计图像、函数图像等的绘制是没有相关组件的帮助的，只有利用手工绘制图片。

QwtPlot是用来绘制二维图像的widget，继承自QFrame 和 QwtPlotDict。不过严格的说来，它只是一个视图窗口，真正的绘制设备是它的中心部件QwtPlotCanvas类。
在它的画板上可以无限制的显示绘画组件。绘画组件可以是曲线（QwtPlotCurve）、标记（QwtPlotMarker）、网格（QwtPlotGrid）、或者其它从QwtPlotItem继承的组件。

QwtPlot拥有4个axes（轴线）

一个QwtPlot有四条坐标抽，每一个项都依附于X轴或者Y轴。每一个轴的刻度可以通过set (QwtScaleDiv)或者根据绘制的图元通过算法(QwtScaleEngine)单独配置。

变量功能yLeftY axis left of the canvas.yRightY axis right of the canvas.xBottomX axis below the canvas.xTopX axis above the canvas.

常用函数接口

接口功能setAxisTitle设置轴标题enableAxis主要是显示xTop，yRight坐标轴setAxisMaxMajor设置某个某个坐标轴扩大比例尺的最大间隔数目setAxisMaxMinor设置某个某个坐标轴缩小比例尺的最大间隔数目setAxisScale禁用自动缩放比例尺，为某个坐标轴指定一个修改的比例尺insertLegend添加图例（标注）

常用组件

组件功能QwtPlotCurve曲线QwtPlotMarker标记QwtPlotGrid网格QwtPlotHistogram直方图other从QwtPlotItem继承的组件QwtPlotItem plot能显示的类，如果想要实现自己绘画图形，要继承此类实现rtti和draw接口QwtPlotPanner平移器（用鼠标左键平移）QwtPlotMagnifier放大器（用鼠标滚轮缩放）QwtPlotCanvas画布QwtScaleMap比例图—可以提供一个逻辑区域到实际区域的坐标转换QwtScaleWidget比例窗口QwtScaleDiv比例布局QwtLegent标注QwtPlotLayout布局管理器QwtScaleDraw自画坐标轴

QwtPlotCure简介

常见接口功能setPen设置画笔setData设置曲线的数据setStyle设置曲线形式，点、直线、虚线等等setCurveAttribute设置曲线属性，一般设置Fittedattch把曲线附加到QwlPlot上

下面看一个小例子，结果如下：
技术分享

该实例绘制了两条sin曲线并自动刷新曲线显示，一个曲线是平缓曲线，另一条是硬拐点曲线，之后按动按键使两个曲线均向右平移，注意，同时移动多条曲线的情况下不要使用setData函数了，程序会错误退出，应该使用setSamples函数，具体参见代码

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color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> curve_r</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//硬折点曲线画布</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QVector</span><span class="str" style="padding: 0px; color: rgb(0, 136, 0);"><</span><span class="hljs-keyword" style="padding: 0px;"><span class="str" style="padding: 0px; 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color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QWidget</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">parent</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">:</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QMainWindow</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">parent</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">),</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">MainWindow</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setupUi</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">this</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">resize</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">640</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">400</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setAutoReplot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-literal" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">true</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置坐标轴的名称</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setAxisTitle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xBottom</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"x->"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setAxisTitle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">yLeft</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"y->"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置坐标轴的范围</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setAxisScale</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">yLeft</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">1.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">1.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置右边标注</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">insertLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(),</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">RightLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//使用滚轮放大/缩小</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotMagnifier</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">canvas</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//使用鼠标左键平移</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotPanner</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">canvas</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//计算曲线数据</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">for</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> x </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> x </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);"><</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">2.0</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> M_PI</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">+=(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">M_PI </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">/</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">10.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">))</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">        xs</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">append</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">        ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">append</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">qSin</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">));</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//平滑曲线</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">attach</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//把曲线附加到plot上</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xs</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setStyle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Lines</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置曲线上是点还是线，默认是线，所以此行可不加</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setCurveAttribute</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Fitted</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-literal" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">true</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//使曲线更光滑，不加这句曲线会很硬朗，有折点</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Qt</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">blue</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">));</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置画笔</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve_r</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">attach</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">plot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve_r</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xs</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve_r</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Qt</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">green</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">));</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">MainWindow</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::~</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">MainWindow</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">delete</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> ui</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">MainWindow</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">on_pushButton_clicked</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">for</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">int</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">count</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()-</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">1</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">>=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">1</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">--)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">        ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">at</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">1</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0.5</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xs</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve_r</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">.</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xs</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">ys</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

散点图：

<code class="hljs cs has-numbering" style="font-family: Arial, Helvetica, sans-serif; padding: 0px;"><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//头文件</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">class</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">:</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">publicQwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">public</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">:</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-title" style="padding: 0px;"><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">();</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">~</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">public</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">:</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-title" style="padding: 0px;"><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">drawPlotCruve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">();</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">private</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">:</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">  curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QVector</span><span class="str" style="padding: 0px; color: rgb(0, 136, 0);"><</span><span class="hljs-keyword" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">double></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> xData</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QVector</span><span class="str" style="padding: 0px; color: rgb(0, 136, 0);"><</span><span class="hljs-keyword" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">double></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> yData</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">};</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//实现文件：</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-preprocessor" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">#include</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"cruvePlot.h"</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">const</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">int</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">LineNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">7</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">const</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">int</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">7</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(){}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::~</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">){}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">void</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">CCruvePlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">drawPlotCruve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">()</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//QMessageBox::information(this,"Running！","Running matlab Function.....");</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    setTitle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"A Simple QwtPlot Demonstration"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置标题</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    insertLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(),</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlot</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">RightLegend</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//设置标线的栏</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    setAxisTitle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xBottom</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"x -->"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    setAxisScale</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">xBottom</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">10.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    setAxisTitle</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">yLeft</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"y -->"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    setAxisScale</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">yLeft</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">10.0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">curve </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"lineFirst"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//实例化一条曲线</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">attach</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">this</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">];</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">y</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">];</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">for</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">int</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);"><</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">++)</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">{</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">      x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">      y</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">+</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">3</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">y</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//传画曲线的数据</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     curve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Qt</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">red</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">));</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">curve2 </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QwtPlotCurve</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-string" style="padding: 0px;"><span class="str" style="padding: 0px; color: rgb(0, 136, 0);">"lineSecond"</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="hljs-comment" style="padding: 0px;"><span class="com" style="padding: 0px; color: rgb(136, 0, 0);">//实例化另一条线</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     curve2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">attach</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">this</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">];</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">y2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">new</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">double</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">];</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">for</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">int</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"> i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">=</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">0</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);"><</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">++){</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">      x2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">*</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">3</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">      y2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">[</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">]=</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">i</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">+</span><span class="hljs-number" style="padding: 0px;"><span class="lit" style="padding: 0px; color: rgb(0, 102, 102);">3</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     curve2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setSamples </span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">x2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">y2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">,</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">PointNum</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">);</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">     curve2</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">-></span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">setPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">QPen</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">(</span><span class="typ" style="padding: 0px; color: rgb(102, 0, 102);">Qt</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">::</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">blue</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">));</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);">    </span><span class="hljs-keyword" style="padding: 0px;"><span class="kwd" style="padding: 0px; color: rgb(0, 0, 136);">return</span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">;</span><span class="pln" style="padding: 0px; color: rgb(0, 0, 0);"></span><span class="pun" style="padding: 0px; color: rgb(102, 102, 0);">}</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code><br style="font-family: Arial, Helvetica, sans-serif; padding: 0px;" /><br style="font-family: Arial, Helvetica, sans-serif; padding: 0px;" /><span class="pln" style="font-family: Arial, Helvetica, sans-serif; padding: 0px; color: rgb(0, 0, 0);">http</span><span class="pun" style="font-family: Arial, Helvetica, sans-serif; padding: 0px; color: rgb(102, 102, 0);">:</span><span class="com" style="font-family: Arial, Helvetica, sans-serif; padding: 0px; color: rgb(136, 0, 0);">//blog.csdn.net/u013007900/article/details/50055353</span>

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